Pasco/Kennewick/Richland to Seattle

What the Data Says About PSC to SEA

The Pasco/Kennewick/Richland to Seattle corridor (PSC → SEA) covers roughly 172 miles and is served by 5 carriers, based on Bureau of Transportation Statistics reporting. Across 13,305 flights in the dataset, this route posts a 88.4% on-time rate with an average delay of 72.5 minutes when flights run late. Over the most recent 24 months of BTS data, 3,817 flights were recorded on this pairing — 26 cancelled (0.7%) and 1 diverted (0.0%). Those baseline metrics tell you what to expect before you book.

Having 5 carriers on the route matters: more carriers generally means more daily schedule options, competitive pricing, and redundancy when flights are cancelled. With 13,305 total flights analyzed, the 88.4% on-time figure is statistically meaningful rather than a small-sample fluke. The 72.5-minute average delay applies only to flights that actually ran late, so it is not the average wait across all departures — the majority of flights on this route depart on time under the BTS definition of a delay (15+ minutes past schedule).

Looking at recent months, Mar 2024 posted the best performance on this corridor at 94% on-time, while Jan 2024 came in at 73% on-time — a 21-point gap between best and worst recent month. For travelers evaluating the PSC to SEA route, the combination of a 88.4% on-time rate, 72.5-minute average delay, 0.7% recent cancellation rate, and 5 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.